'Hearts' in the Bible

"LORD God of Israel, there is no one like you, God in heaven above or on the earth below, who watches over his covenant, showing gracious love to your servants who live their lives in your presence with all their hearts. It is you, LORD God, who have kept your promise to my father, your servant David, that you made to him. Indeed, you made a commitment to my father David and then personally fulfilled what you had promised today.

then hear from heaven, the place where you reside, and forgive, repaying each person according to all of his ways, since you know their hearts for you alone know the hearts of all human beings

if they turn their hearts back to you in the land where they have been taken captive, repent, and pray to you even if they do so in the land of their captivity confessing, "We have sinned, we have committed abominations, and practiced wickedness,'

so that he may turn our hearts toward him, so that we may live life his way, keeping his commands, statutes, and ordinances that he gave to our ancestors.

If these people keep going up to Jerusalem to offer sacrifices to the LORD there, the hearts of these people will return to their lord, King Rehoboam of Judah. Then they'll kill me and return to Rehoboam, king of Judah!"

Answer me, LORD! Answer me so that this people may know that you, LORD, are God, and that you are turning back their hearts again."